Overview What is pure red cell aplasia (PRCA)? Pure red cell aplasia (PRCA) is a rare blood disorder that happens when your bone marrow doesn’t produce the normal number of red blood cells. When your red blood cell supply drops below normal levels, you have anemia.

Renal hypoplasia is a congenitally small kidney without dysplasia and can be bilateral or unilateral (see Fig. 33 ). Fig. 33. Renal agenesis/hypoplasia Key findings in renal agenesis: Location: Unilateral or bilateral; if bilateral, findings can be asymmetric (e.g. agenesis on one side, hypoplasia on the other side).